Is it not the case that with the Scottish Parliament they literally can't just call an election, there are very specific rules on the length of terms and when the elections can take place?
edited to add: aye, it can only be held every five years.
Date of elections to the Scottish Parliament
The Scotland Act 1998 sets out the procedures for the holding of Scottish Parliament elections. Section 2 requires a Scottish Parliament election to be held on the first Thursday in May in the fifth calendar year following the previous Scottish Parliament election.
There are a number of possible situations in which it might prove necessary for the date of a scheduled Scottish Parliament election to change. One possibility is that a UK Parliament General election is called on the date in question. Under the Scotland Act, this would automatically require a new date to be arranged for the Scottish Parliament election. The Dissolution and Calling of Parliament Act 2022 means that a UK Parliamentary election can be announced at short notice on the decision of the Prime Minister (25 working days following the proclamation dissolving the existing Parliament).
Other possible examples that might require a change in date include a public health emergency or major security incident.
The Presiding Officer of the Scottish Parliament has a limited power to propose a new date for the poll for a Scottish Parliament election which is not more than one month before or after the first Thursday in May.